Along with the people with incredibly small penises (and equally miniscule brains), the hoaxers awake at 5:00 include: the ones who have been on the piss all night, and have decided what an awfully good idea a hoax call would be to round the evening off; the people who have become bored with playing computer games till the early hours, and want a bit of REAL excitement (eg seeing an emergency vehicle driving on blues and twos; people with certain MH problems, for whom nocturnal insomnia is usual, and those on certain medications, which similarly have insomnia as a side effect, Oh and I once read that poorly-paid, very bored night security guards were prone to making hoax calls, but whether that's still the case I have no idea.